Which of the following decomposition reactions is/are correct?
a) 2naoh 2na + o2 + h2
b) 2naoh 2na + h2o + 1/2o2
c) 2naoh na2o + h2o
d) 2naoh 2na + h2o2

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

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6. using 3 – 4 sentences explain (in your own words) why water expands when it freezes? 7. using your knowledge of colligative properties explain whether sodium chloride or calcium chloride would be a more effective substance to melt the ice on a slick sidewalk. use 3 – 4 sentences in your explanation.